Electronics > Repair
W&G sna-20/23 spectrum analyzer repair
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dxl:
I "fixed" the display problem on my unit now by replacing the EL screen with a 8.4" 800x600 TFT screen. The firmware needed a few tweaks to recognize the 640x350 video mode, but otherwise it's looking ok. Not as sharp as the EL display because the image gets scaled, but still ok. It also has the nice side effect of adding color. The size of the panel is almost the same as the original one, it's a bit more in height, and about 1cm less in width.
alexturner:
I had a good year or so with mine working immaculately and today I went to use it and noticed that it's deaf :(

Not sure where to start looking, I've tried frequencies up to 1GHz (limit of my source), have attached a Log Normal antenna and nothing. Changing attenuators makes no change, any ideas where to start with this? This has been a taxing instrument to own so far  ;D
dxl:
Can you post a picture of the screen in full span mode? Do you see the normal noise floor?
alexturner:
Hey dxl - It sure seems as if it's the normal noise floor in full span. How come?
aseok:
Following is picture of sna-20 2101b board, the inductor was blown and removed (white blank part of pcb) also at least some other damaged/blown parts visible. Is there any chance to fix this? is it worth the effort at all?
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